CN1489280A - Current detecting device and motor drive device using same - Google Patents
Current detecting device and motor drive device using same Download PDFInfo
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- CN1489280A CN1489280A CNA031560180A CN03156018A CN1489280A CN 1489280 A CN1489280 A CN 1489280A CN A031560180 A CNA031560180 A CN A031560180A CN 03156018 A CN03156018 A CN 03156018A CN 1489280 A CN1489280 A CN 1489280A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/145—Indicating the presence of current or voltage
- G01R19/15—Indicating the presence of current
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Abstract
A current detecting apparatus and a motor driving apparatus using the same are provided to detect the electric current flowing both the positive direction and the negative direction by using only a positive DC supply source without using a negative DC supply source. A current detecting apparatus includes a positive DC supply source, first to third resistors, and a differential amplification unit. The first resistor to the third resistors(2,3,4) are connected serially each other. The differential amplification unit(5) is supplied from the positive DC supply source(1) in order to calculate a difference between a voltage of a connection point of the first resistor and the second resistor and a predetermined voltage. The third resistor becomes at least a part of a current route of the current as a detecting target. The first resistor is connected to the positive DC supply source at a terminal which is not connected with the second resistor. The third resistor is grounded at a terminal which is not connected with the second resistor. A constant term of an arithmetic formula of the differential amplification unit means is formed as a positive value by setting each resistance value of the first resistor, the second resistor, and the third resistor and the predetermined voltage.
Description
Technical field
The present invention relates in the control system that only has the positive direct-current power supply (that is, the single supply system), just can detect the current sensing means and the rational motor driver that is mounted with this current sensing means of the electric current that flows through in positive and negative two directions by simple formation.
Background technology
In the past, when detecting the electric current on a certain circuit, flow through, used usually and on this circuit, inserted current sense resistor, detected because of on this resistance, flowing through the method for the voltage drop that sensed current produces.In this method, being under the bidirectional flow situation about crossing in sensed current, because the voltage drop of current sense resistor is the voltage of positive and negative polarities also, is the circuit that can handle the positive and negative polarities signal so be used for that the signal processing circuit of current detecting also needs.Use Fig. 7 that this example is described.
Fig. 7 is the circuit that is determined at the electric current I that flows through in positive and negative two directions between current sense resistor 14 and the ground connection.This circuit by positive direct-current power supply 1, negative DC power supply 17, with positive direct-current power supply 1 as the microcomputer with AD translation function 7 of power supply, current sense resistor 14, with positive direct-current power supply 1 and negative DC power supply 17 as the adder calculator 15 of power supply, the reference voltage 16 that is used to adjust the output-voltage levels of adder calculator 15 constitutes.The value of reference voltage 16 is made as Vref3.Below, this action is described.
Through current sense resistor 14 and and flow through sensed current I at positive and negative both direction between the ground connection.When the direction of arrow of sensed current I in figure flow through, the voltage that is input to adder calculator 15 was for just, and when sensed current I edge was flow through with direction of arrow rightabout, the voltage that is input to adder calculator 15 was for negative.Therefore, adder calculator 15 needs the power supply of positive and negative polarities, so be provided with positive direct-current power supply 1 and negative DC power supply 17 respectively.
Judge the output Vo of adder calculator 15 by microcomputer 7.But, because microcomputer 7 drives by positive direct-current power supply 1 (voltage is Vcc), thus as the output Vo of the adder calculator 15 of its input also need from 0 to Vcc on the occasion of.Therefore, adder calculator 15 adds the voltage Vref3 of reference voltage 16 in the voltage drop of current sense resistor 14, adjusts the value of output Vo.
Fig. 8 is sensed current I and the figure that concerns usefulness that exports Vo in the expression circuit shown in Figure 7.In Fig. 8, respectively transverse axis is represented sensed current I, the longitudinal axis is represented to export Vo.When the gain with adder calculator 15 was made as A, then the pass of this output valve Vo and sensed current I was the oblique line of being put down in writing.For example, if sensed current I is zero, then owing to equaling on adder calculator 15, only to have applied reference voltage 16, so the output of adder calculator 15 at this moment is Vo (AVref3).That is, the sensed current I for positive and negative two directions can obtain positive output Vo.This method for example, is documented in " design of OP amplifier circuit " (author is Gang Cun Di husband, publishes Co., Ltd. by CQ and publishes in 1973).
Summary of the invention
A kind of current sensing means comprises:
The positive direct-current power supply;
First resistance that is connected in series, second resistance and the 3rd resistance;
Differential motion amplifying unit from positive direct-current power supply supply power, is calculated the tie point voltage of first resistance and second resistance and the difference of assigned voltage, it is characterized by,
The 3rd resistance is at least a portion of the current path that flows through of sensed current,
In the terminal of first resistance, a side terminal that is not connected with second resistance is connected to the positive direct-current power supply,
In the terminal of the 3rd resistance, with a side terminal ground connection that is not connected with second resistance,
Constant term according to the arithmetic expression of differential motion amplifying unit is positive mode, sets the resistance value of first resistance, the resistance value of second resistance, the resistance value and the assigned voltage of the 3rd resistance.
A kind of motor driver comprises:
Above-mentioned current sensing means,
Has second DC power supply of public negative pole (ground connection) with the positive direct-current power supply;
From the second direct-current power supply power supply, the semiconductor switch group of bridge construction is made in a plurality of unit that reverse parallel connection is connected semiconductor switch and diode;
Drive the driver element of semiconductor switch group;
Be connected to the motor of semiconductor switch group output; With
The voltage and second assigned voltage that will produce on the 3rd resistance are compared, and the comparing unit of driver element is delivered in this output, it is characterized in that:
Sensed current is the electric current that flows through between the negative pole (ground connection) of the negative DC line of semiconductor switch group and second DC power supply, and the 3rd resistance is at least a portion of the current path that flows through of sensed current.
Description of drawings
Fig. 1 is the pie graph of embodiments of the present invention 1.
Fig. 2 is the performance plot of embodiments of the present invention 1.
Fig. 3 is the concrete pie graph of embodiments of the present invention 1.
Fig. 4 is the pie graph of embodiments of the present invention 2.
Fig. 5 is the concrete pie graph of embodiments of the present invention 2.
Fig. 6 is the pie graph of embodiments of the present invention 3.
Fig. 7 is the pie graph of conventional example.
Fig. 8 is the performance plot of conventional example.
Embodiment
Below, with reference to accompanying drawing, embodiments of the present invention are described.
(execution mode 1)
Fig. 1 is the pie graph of the current sensing means of embodiments of the present invention 1.First resistance 2, second resistance 3 are connected with this in proper order with the 3rd resistance 4 with being one another in series.In two terminals of first resistance 2, a side terminal that is connected with second resistance 3 is not connected to positive direct-current power supply 1.The voltage of DC power supply 1 is made as Vcc.In two terminals of the 3rd resistance 4, with a side terminal ground connection that is not connected with second resistance 3.
Sensed current I is offered the tie point of second resistance 3 and the 3rd resistance 4.That is, the 3rd resistance 4 forms the path that sensed current I flows through, and the 3rd resistance 4 plays the effect of current sense resistor.Differential motion amplifying unit 5 is from positive direct-current power supply 1 supply power.The tie point voltage of first resistance 2 and second resistance 3 is input to the positive input terminal of differential motion amplifying unit 5.On the other hand, will be input to negative input end of differential motion amplifying unit 5 as the assigned voltage 6 of benchmark.The current potential of this assigned voltage 6 is Vref.The output of differential motion amplifying unit 5 is the output of current sensing means.
In addition, as differential motion amplifying unit 5, the input signal that uses differential amplifier, operational amplifier, an input terminal input of subtend has positive gain and the input signal of another input terminal input of subtend has the amplifying circuit of negative gain etc.
Fig. 2 is the performance plot of the current sensing means of Fig. 1, the relation of the output Vo of expression sensed current I and current sensing means.In Fig. 2, represent sensed current I, represent output Vo with transverse axis respectively from differential motion amplifying unit 5 with the longitudinal axis.Oblique line is the straight line of expression I and Vo relation.The detailed description of Fig. 2 is described below in addition.
Fig. 3 is the concrete pie graph that constitutes of presentation graphs 1 more specifically.Omit the explanation part identical with Fig. 1.Differential motion amplifying unit 5 is made of operational amplifier 5a, operational amplifier 5b, resistance 5c, resistance 5d, resistance 5e and resistance 5f.Operational amplifier 5a and operational amplifier 5b are from DC power supply 1 supply power.Resistance 6a and resistance 6b are connected in series.In two terminals of resistance 6a, a side terminal that is free of attachment to resistance 6b is connected to positive direct-current power supply 1.On the other hand, in two terminals of resistance 6b, the side terminal ground connection of resistance 6a will be free of attachment to.The tie point voltage of resistance 6a and resistance 6b is made as assigned voltage 6.That is, the tie point voltage of resistance 6a and resistance 6b is Vref.
Below, the at first action in the formation of key diagram 1.If the voltage that will be applied to the positive input terminal of differential motion amplifying unit 5 among Fig. 1 is made as Vi, the gain of differential motion amplifying unit 5 is made as A, then obtain the output voltage V o of differential motion amplifying unit 5 by (formula 1).
Vo=A (Vi-Vref) (formula 1)
In addition, if respectively the value of first resistance 2, second resistance 3, the 3rd resistance 4 is made as R1, R2, R3 respectively, then above-mentioned Vi becomes (formula 2).
Vi=(R2+R3) Vcc/ (R1+R2+R3)+R1R3I/ (R1+R2+R3) (formula 2)
According to (formula 1) and (formula 2), output voltage V o becomes (formula 3).
Vo＝A[(R2+R3)·Vcc/(R1+R2+R3)-Vref]
+ AR1R3I/ (R1+R2+R3) (formula 3)
(formula 3) first is constant term, can select R1, R2, R3, Vcc and Vref, and make this value on the occasion of.
Now, when selecting stated number, and when making first the value of (formula 3) be Vcc/2, the relation of sensed current I and output voltage V o becomes the oblique line that Fig. 2 puts down in writing, and can obtain positive output voltage V o for the electric current I of positive and negative two directions.At this moment, for example, if sensed current I is zero, then Vo is Vcc/2.In addition, because according to making (formula 3) first to be the Vcc/2 selectivity constant, so become the electric current that can detect positive and negative same range as.In fact, according to making for the positive and negative variable range of sensed current I output voltage V o be included in to allow variable range that (mode in 0～Vcc) selects each constant to get final product.
Below, be described more specifically action with Fig. 3.Value with resistance 5c, 5d, 5e, 5f, 6a, 6b among Fig. 3 is made as R4, R5, R6, R7, R8, R9 respectively.Here if R4 is identical value with R7, R5 and R6, then represent the characteristic of differential motion amplifying unit 5 shown in Figure 3 by (formula 4).
Vo=A (Vi-Vref)=(1+R4/R5) (Vi-Vref) (formula 4)
In addition, by the assigned voltage 6 (Vref) of (formula 5) expression as reference voltage.
Vref=VccR9/ (R8+R9) (formula 5)
Can realize having current sensing means with Fig. 2 identical characteristics by above-mentioned formation, action.
(execution mode 2)
Fig. 4 is the pie graph of the current sensing means of embodiments of the present invention 2.Omit the explanation part identical with Fig. 1.Correcting unit 7 is proofreaied and correct the error that is comprised in the output Vo of differential motion amplifying unit 5.Correcting unit 7 has AD translation function and correction calculation function.In Fig. 4, the situation that correcting unit 7 is comprised AD converter 7a and correction computing unit 7b as an example.In addition, as power supply, its input allowed band also is on the occasion of (0～Vcc) to this correcting unit 7 with above-mentioned positive direct-current power supply 1.
Fig. 5 more specifically represents above-mentioned formation.Fig. 5 adds microcomputer to be used as correcting unit 7 on Fig. 3, because other formation is identical with Fig. 3, and the Therefore, omited explanation.Below, with Fig. 5 its action is described.
In the formation of Fig. 5, in above-mentioned, illustrated by (formula 4) expression differential motion amplifying unit 5 output voltage V o, by (formula 2) expression comprise in the formula Vi, by (formula 5) expression Vref situation.
Here, above-mentioned Vo is made as same value with above-mentioned being similarly with R4 and R7, R5 and R6 by the condition of (formula 4) expression, and still in fact there is error in each resistance, so output voltage V o is not the same with (formula 4), and includes error.
The value Vcc of equally, above-mentioned positive direct-current power supply 1, the value Vref of assigned voltage 6 also have error.As a result, though in execution mode 1, selected each constant, and make (formula 3) first to be in fact also to have produced deviation by Vcc/2 by these errors.Here, as the microcomputer saved differences Voff of correcting unit 7, the difference of the ideal value Vcc/2 when the output voltage V o of the differential motion amplifying unit 5 when difference Voff is zero for sensed current I and the error of above-mentioned each constant are zero.Like this, carry out deducting the output voltage of the differential motion amplifying unit 5 when sensed current I flows through the computing of Voff as the microcomputer of correcting unit 7.Thus, first error of recoverable (formula 3).
In addition, though given an example in the above description, be not limited to this as the microcomputer of correcting unit 7.As correcting unit 7, also have saved differences Voff and carry out deducting the output voltage of the differential motion amplifying unit 5 when sensed current I flows through the circuit or the processor of Voff calculation function.
(execution mode 3)
Fig. 6 is the pie graph of the motor driver of embodiments of the present invention 3.Second DC power supply 8 is power supplys of drive motors 11.The negative pole of its negative pole and positive direct-current power supply 1 has common potential (earthing potential).Semiconductor switch group 9 is made of 6 unit.Each unit is made of the diode 9b unit that the power transistor 9a as semiconductor switch is connected with reverse parallel connection.So-called reverse parallel connection connects, and is meant that the conducting sense of current of power transistor 9a and the conducting sense of current of diode 9b are reverse each other being connected in parallel.Semiconductor switch group 9 constitutes 3 phase electric bridges by these 6 unit.The dc supply input of this 3 phase electric bridge is connected to second DC power supply 8, ac output end is connected on the motor 11.
In addition, between the negative pole (ground connection) of the negative DC line of semiconductor switch group 9 and second DC power supply 8, connect resistance 4, and constitute the part of above-mentioned current sensing means.Omit explanation for the part identical with the current sensing means of execution mode 1 and 2.
Here, the value with above-mentioned assigned voltage 6 is designated as Vref1.Here, illustrate that employing comparator 12 is used as the situation of comparing unit.As a comparison the comparator 12 of unit with positive direct-current power supply 1 as power supply.The voltage of the tie point of second resistance 3 and the 3rd resistance 4 is input to the negative terminal of comparator 12, will be input to the plus end of comparator 12 as second assigned voltage 13 of the voltage suitable with the permission current value of semiconductor switch group 9.This second assigned voltage 13 is Vref2.The output of comparator 12 is imported into driver element 10.Driver element 10 drives 6 power transistor 9a of semiconductor switch group 9.
This action in the above-described configuration is described.Driver element 10 generates drive signal and drives semiconductor switch group 9.Under the situation of operated motor 11, on the 3rd resistance 4, flow through the electric current relevant with the electric current that on motor 11, flows through by the action of semiconductor switch group 9.This electric current of operating condition according to motor 11 is the electric current of positive and negative two directions.By detecting this electric current by the current sensing means described in execution mode 1 and 2, the frequent load size of monitoring motor 11.Generate the drive signal that is suitable for driver element 10 according to this, and steady running motor 11.
In addition, the voltage drop and second assigned voltage 13 (Vref2) that compare the 3rd resistance 4 that produces by determined electric current I by comparator 12.When this voltage drop surpassed afore mentioned rules voltage 13 (Vref2), comparator 12 made output oppositely, and the drive signal of driver element 10 is stopped.Because assigned voltage 13 (Vref2) is set at the voltage suitable with the permission current value of semiconductor switch group 9, so but go out the overcurrent of semiconductor switch group 9 by this circuit high speed detection, prevent overcurrent.
In addition, in the above description,, be not limited thereto though the comparator 12 of having given an example is used as comparing unit.The unit can be that the tie point voltage of second resistance 3 and the 3rd resistance 4 is compared with second assigned voltage 13 as a comparison, according to this result control signal is offered driver element 10.That is, comparing unit can be made of computing circuit, logical circuit, differential amplifier, operational amplifier and the processor etc. of these work of enforcement.
As mentioned above; the present invention can only constitute motor driver by positive direct-current power supply 1; this motor driver detects at both direction and flows through the electric current of motor 11, the load state and the suitable drive motors 11 of monitoring motor 11; simultaneously, the protective device that also has the overcurrent of high speed cut-off semiconductor switches set 9.In addition, the present invention also passes through and uses current sense resistor, can make device high efficiency, miniaturization, cost degradation.
As mentioned above, according to current sensing means of the present invention and motor driver, can constitute the system that does not use negative DC power supply and only just can detect the electric current that flows through in positive and negative two directions by the positive direct-current power supply.
In addition,, can significantly proofread and correct the error of each element that constitutes current sensing means, only just can realize high-precision twocouese current detecting, and need not add special correcting circuit by the positive direct-current power supply according to current sensing means of the present invention and motor driver.In addition, thus, can realize high precision int, miniaturization, the cost degradation of current sensing means and motor driver.
Also have; according to current sensing means of the present invention and motor driver; can be by a current sense resistor simultaneously with being the detection of the required current of electric of control motor and the current detecting that the required semiconductor switch group of semiconductor switch group is controlled in protection; simultaneously, can only constitute these systems by the positive direct-current power supply.Thus, can realize high precision int, miniaturization, the cost degradation of current sensing means and motor driver.
Claims (3)
1. current sensing means comprises:
The positive direct-current power supply;
First resistance that is connected in series, second resistance and the 3rd resistance;
Differential motion amplifying unit from positive direct-current power supply supply power, is calculated the tie point voltage of described first resistance and described second resistance and the difference of assigned voltage, it is characterized in that:
Described the 3rd resistance is at least a portion of the current path that flows through of sensed current;
In the terminal of described first resistance, a side terminal that is not connected with described second resistance is connected to described positive direct-current power supply,
In the terminal of described the 3rd resistance, with a side terminal ground connection that is not connected with described second resistance,
Set the resistance value and the described assigned voltage of the resistance value of the resistance value of described first resistance, described second resistance, described the 3rd resistance, make the constant term of arithmetic expression of described differential motion amplifying unit for just.
2. current sensing means according to claim 1 is characterized in that, also comprises:
Correcting unit, deduct Voff the output valve of the described differential motion amplifying unit when described sensed current flows through, Voff is the difference between the idea output of the error of real output value and the composed component of the described differential motion amplifying unit of described sensed current when being zero when being zero, and this correcting unit provides power supply from described positive direct-current power supply.
3. motor driver comprises:
Current sensing means described in claim 1 or the claim 2;
Has second DC power supply of public negative pole (ground connection) with described positive direct-current power supply;
The semiconductor switch group from the described second direct-current power supply power supply, is made bridge construction with semiconductor switch and diode reverse by a plurality of unit after being connected in parallel;
Driver element drives described semiconductor switch group;
Motor is connected to described semiconductor switch group lead-out terminal; With
Comparing unit is compared the voltage and second assigned voltage that produce on described the 3rd resistance, and described driver element is delivered in this output; It is characterized in that:
Described sensed current is the electric current that flows through between the negative pole (ground connection) of the negative DC line of described semiconductor switch group and described second DC power supply, and described the 3rd resistance is at least a portion of the current path that flows through of described sensed current.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002290069A JP3753120B2 (en) | 2002-10-02 | 2002-10-02 | Bidirectional current detection device and motor drive device |
| JP2002290069 | 2002-10-02 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1489280A true CN1489280A (en) | 2004-04-14 |
| CN1240181C CN1240181C (en) | 2006-02-01 |
Family
ID=31987170
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031560180A Expired - Lifetime CN1240181C (en) | 2002-10-02 | 2003-08-28 | Current detecting device and motor drive device using same |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP1406095B1 (en) |
| JP (1) | JP3753120B2 (en) |
| KR (1) | KR100951223B1 (en) |
| CN (1) | CN1240181C (en) |
| ES (1) | ES2305372T3 (en) |
| HK (1) | HK1062614A1 (en) |
| MY (1) | MY136378A (en) |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102253267A (en) * | 2010-05-18 | 2011-11-23 | 松下电器产业株式会社 | Motor current detecting IC and motor current detector or motor control apparatus using the same |
| CN102298086A (en) * | 2010-05-18 | 2011-12-28 | 松下电器产业株式会社 | Motor current detecting IC and motor current detector or motor control apparatus using the same |
| CN102395890A (en) * | 2009-04-17 | 2012-03-28 | 大金工业株式会社 | Current-sensing circuit and air-conditioning device provided therewith |
| CN102628891A (en) * | 2012-04-28 | 2012-08-08 | 航天科技控股集团股份有限公司 | Detection system and detection method for positive-inverse current single loop based on controller area network (CAN) |
| CN104734577A (en) * | 2013-12-24 | 2015-06-24 | 日本电产高科电机株式会社 | Motor driving device |
| CN107223296A (en) * | 2015-03-04 | 2017-09-29 | 黑拉许克联合股份有限公司 | Method and apparatus for determining load current |
| CN107430153A (en) * | 2015-04-10 | 2017-12-01 | 三菱电机株式会社 | Current sensing means |
| CN107976629A (en) * | 2017-12-25 | 2018-05-01 | 深圳市巴丁微电子有限公司 | A kind of detection method and device of current of electric flow direction |
| CN108267640A (en) * | 2018-01-23 | 2018-07-10 | 北京东方计量测试研究所 | A kind of device of single supply supplying measure resistance |
| CN110622014A (en) * | 2017-05-17 | 2019-12-27 | ams有限公司 | Circuit arrangement and method for measuring resistance |
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|---|---|---|---|---|
| JP4403387B2 (en) | 2004-04-26 | 2010-01-27 | ソニー株式会社 | Solid-state imaging device and driving method of solid-state imaging device |
| CN103926453B (en) * | 2014-04-30 | 2017-03-29 | 航天科技控股集团股份有限公司 | Positive reverse current single loop detection means based on CAN network |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5204594A (en) * | 1991-10-03 | 1993-04-20 | Sgs-Thomson Microelectronics, Inc. | Circuit for providing a signal proportional to the average current flowing through coils of a motor operated in both linear and PWM modes |
| JPH05333063A (en) * | 1992-05-29 | 1993-12-17 | Nippondenso Co Ltd | Overcurrent detector for automobile |
| JPH0834359A (en) * | 1994-07-22 | 1996-02-06 | Honda Motor Co Ltd | Motor-driven power steering device |
| WO1997050162A1 (en) * | 1996-06-26 | 1997-12-31 | Hitachi, Ltd. | Motor driving apparatus |
| JP3235027B2 (en) * | 1997-03-11 | 2001-12-04 | 信濃電気株式会社 | Concrete vibrator |
| JPH10300798A (en) * | 1997-04-24 | 1998-11-13 | Sanyo Electric Co Ltd | Current detection circuit having automatic offset correction circuit |
| KR100553293B1 (en) * | 1999-02-02 | 2006-02-22 | 로크웰삼성오토메이션 주식회사 | An apparatus for eliminating variable offset values of current detecting signals and its method |
-
2002
- 2002-10-02 JP JP2002290069A patent/JP3753120B2/en not_active Expired - Fee Related
-
2003
- 2003-07-16 KR KR1020030048680A patent/KR100951223B1/en not_active IP Right Cessation
- 2003-07-24 ES ES03016549T patent/ES2305372T3/en not_active Expired - Lifetime
- 2003-07-24 EP EP03016549A patent/EP1406095B1/en not_active Expired - Lifetime
- 2003-07-30 MY MYPI20032854A patent/MY136378A/en unknown
- 2003-08-28 CN CNB031560180A patent/CN1240181C/en not_active Expired - Lifetime
-
2004
- 2004-07-24 HK HK04105483A patent/HK1062614A1/en not_active IP Right Cessation
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102395890A (en) * | 2009-04-17 | 2012-03-28 | 大金工业株式会社 | Current-sensing circuit and air-conditioning device provided therewith |
| CN102395890B (en) * | 2009-04-17 | 2014-02-26 | 大金工业株式会社 | Current-sensing circuit and air-conditioning device provided therewith |
| CN102253267A (en) * | 2010-05-18 | 2011-11-23 | 松下电器产业株式会社 | Motor current detecting IC and motor current detector or motor control apparatus using the same |
| CN102298086A (en) * | 2010-05-18 | 2011-12-28 | 松下电器产业株式会社 | Motor current detecting IC and motor current detector or motor control apparatus using the same |
| CN102253267B (en) * | 2010-05-18 | 2014-08-27 | 松下电器产业株式会社 | Motor current detecting IC and motor current detector or motor control apparatus using the same |
| CN102298086B (en) * | 2010-05-18 | 2014-09-24 | 松下电器产业株式会社 | Motor current detecting IC and motor current detector or motor control apparatus using the same |
| CN102628891A (en) * | 2012-04-28 | 2012-08-08 | 航天科技控股集团股份有限公司 | Detection system and detection method for positive-inverse current single loop based on controller area network (CAN) |
| CN104734577B (en) * | 2013-12-24 | 2018-10-16 | 日本电产高科电机株式会社 | Motor drive |
| CN104734577A (en) * | 2013-12-24 | 2015-06-24 | 日本电产高科电机株式会社 | Motor driving device |
| CN107223296A (en) * | 2015-03-04 | 2017-09-29 | 黑拉许克联合股份有限公司 | Method and apparatus for determining load current |
| CN107223296B (en) * | 2015-03-04 | 2020-03-13 | 黑拉许克联合股份有限公司 | Method and apparatus for determining load current |
| CN107430153A (en) * | 2015-04-10 | 2017-12-01 | 三菱电机株式会社 | Current sensing means |
| CN107430153B (en) * | 2015-04-10 | 2020-08-07 | 三菱电机株式会社 | Current detection device |
| CN110622014A (en) * | 2017-05-17 | 2019-12-27 | ams有限公司 | Circuit arrangement and method for measuring resistance |
| US11119135B2 (en) | 2017-05-17 | 2021-09-14 | Sciosense B.V. | Circuit arrangement and method for resistance measurement |
| CN107976629A (en) * | 2017-12-25 | 2018-05-01 | 深圳市巴丁微电子有限公司 | A kind of detection method and device of current of electric flow direction |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP1406095B1 (en) | 2008-05-07 |
| JP2004129388A (en) | 2004-04-22 |
| JP3753120B2 (en) | 2006-03-08 |
| ES2305372T3 (en) | 2008-11-01 |
| EP1406095A1 (en) | 2004-04-07 |
| KR100951223B1 (en) | 2010-04-05 |
| HK1062614A1 (en) | 2004-11-12 |
| CN1240181C (en) | 2006-02-01 |
| MY136378A (en) | 2008-09-30 |
| KR20040030233A (en) | 2004-04-09 |
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